Product Description How to ultraviolet work By emitting UV light with the peak wavelength of 253.7nm.Ultraviolet bacteria, is safe to use, reliable and chemical free, UV treatment does not change the tast, odor, PH, or the general chemistry of water. How to install UV system includes a user installation manual for instruction. if you still have technical or installation question, please contact us directly by online or email . General operation and maintenance: To clean the quartz sleeve every 6-12 months, replace every 24 months. Replace UV lamp every 12 months to keep best performance. Wide Application HQUA UV are commonly seen in various water treatment systems: a) Residential water purification, to bring health and safety to our daily life; b) Industrial water , to supply treated water for different needs, such as clean water for irrigation and fish tank, cooling water for production; c) Waste water reuse, to avoid sewage pollution and increase utilization of water, and make the earth a better place for our children.